<!DOCTYPE html>
<html>
	<head>
		<meta charset="UTF-8">
		<title></title>
		<style type="text/css">
			body {
				margin: 0;
				padding: 0 50px;
			}

			.box {
				/*display: block;*/
				width: 150px;
				height: 50px;
				padding: 50px;
				border: 50px solid #F00;
				margin: 50px;
			}

			.classicBox {
				width: 50px;
				height: 50px;
				background-color: #000;
			}
		</style>
	</head>
	<body>
		<span class="box">盒子内部的内容</span>
		<div class="classicBox"></div>
	</body>
</html>
